<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" v-model="num1">
    <input type="text" v-model="num2">
    <input type="button" value="加"  @click="f('+')">
    <input type="button" value="减"  @click="f('-')">
    <input type="button" value="乘"  @click="f('*')">
    <input type="button" value="除"  @click="f('/')">
    <h1>{{info}}</h1>
</div>
<script src="js/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
            info:"",num1:"",num2:""
        },
        methods:{
            f(x){
                if(isNaN(v.num1)||isNaN(v.num2)){
                    v.info = "输入错了,请重新输入";
                    return;
                }
                v.info = eval(v.num1+x+v.num2)
            }
        }
    })
</script>
</body>
</html>